A 2.0 kg particle moving along the x-axis experiences the force shown in FIGURE EX9.22. The particle's velocity is 3.0 m/s at x = 0 m. At what point on the x-axis does the particle have a turning point?

검증된 단계별 안내

Step 1: Understand the concept of a turning point. A turning point occurs when the particle's velocity becomes zero. This happens when the particle's kinetic energy is completely converted into work done against the force acting on it.

Step 2: Use the work-energy principle. The work done by the force on the particle is equal to the change in its kinetic energy. The work done can be calculated as the area under the force vs. position graph.

Step 3: Calculate the initial kinetic energy of the particle. The formula for kinetic energy is \( KE = \frac{1}{2} m v^2 \), where \( m \) is the mass of the particle and \( v \) is its velocity. Substitute \( m = 2.0 \, \text{kg} \) and \( v = 3.0 \, \text{m/s} \).

Step 4: Integrate the force over the distance to find the work done. Divide the graph into sections based on the constant force values and calculate the area of each section (rectangles). Add these areas cumulatively until the total work equals the initial kinetic energy.

Step 5: Determine the position \( x \) where the total work equals the initial kinetic energy. This position corresponds to the turning point of the particle on the x-axis.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Force and Motion

Force is a vector quantity that causes an object to accelerate, change direction, or deform. In this context, the force acting on the particle varies with position, as shown in the graph. Understanding how force influences motion is crucial for determining the particle's behavior along the x-axis, particularly when identifying turning points where the particle's velocity changes direction.

Turning Point

A turning point occurs when an object changes its direction of motion. For a particle moving along the x-axis, this happens when the net force acting on it becomes zero, leading to a momentary stop before reversing direction. Analyzing the force graph allows us to identify the position where the force changes from positive to negative, indicating the location of the turning point.

Work-Energy Principle

The work-energy principle states that the work done on an object is equal to the change in its kinetic energy. In this scenario, as the particle moves through different positions, the work done by the varying force affects its velocity. By calculating the work done up to a certain point, we can determine how the particle's kinetic energy changes, which is essential for finding the turning point.